Jobu Formation

The Jobu Formation is a Cretaceous geologic formation of Late Cenomanian age. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus. The oldest confirmed tyrannosaurid premaxillary tooth was recovered from the Jobu Formation. The mammal Sorlestes is also known from the formation.

Fossil content
The following fossils were reported from the formation:
 * Mammals
 * Sorlestes mifunensis
 * Dinosaurs
 * Carnosauria indet.) (=Allosaurus sp.?)
 * Ceratopsia indet.
 * Tetanurae indet.
 * Theropoda indet.
 * Tyrannosauridae indet.
 * Turtles
 * Adocus sp.
 * Shachemys sp.
 * Nanhsiungchelyidae indet.